altpooler might still be working, but I'm not certain. I think the crons might have to catch up or something.
Might be it, whos the owner of that pool?
altpooler is a legit pool but I think their ddos protection and ability to handle malicious attacks is pretty poor
coin-miners AND altpooler both had the exact same issues with BTCdark rush.
I can also say that scorpio18 (coin-miners owner) is legit and seems to work hard to keep his pool up and doing well.
Unfortunately they both seem to lack the infrastructre (or whatever) to deal with things like suprnova and dedicated and pool.mn seem to be able to fix/resist.